期刊
CHEMPHYSCHEM
卷 8, 期 11, 页码 1657-1663出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200700210
关键词
femtochemistry; IR spectroscopy; isomerization; phytochromes; time-resolved spectroscopy
The photoinduced primary reaction of the biliverdin binding phytochrome Agp1 (Agp1-BV) from Agrobacterium tumefaciens was investigated by sub-picosecond time-resolved Vis pump-IR probe spectroscopy. Three time constants of tau(1) = 0.7 +/- 0.05 ps, tau(2) = 3.3 +/- 0.2 ps and tau(3) = 33.3 +/- 1.5 ps could be isolated from the dynamics of structurally specific marker bands of the BV chromophore. These results together with those of accompanying sub-picosecond Vis pump-Vis probe spectroscopy allow the extension of the reaction scheme for the primary process by a vibrationally excited electronic ground state. The isomerization at the C15=C16 bond occurs within the lifetime of the excited electronic state. A quantum yield of 0.094 for the primary reaction is determined, suggesting that the quantum yield of formation of the P-fr far-red-absorbing form is already established in the primary photoreaction of the P-r (red-absorbing) form.
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